Author: tychon
Date: Wed Apr 9 14:50:55 2014
New Revision: 264302
URL: http://svnweb.freebsd.org/changeset/base/264302
Log:
Constrain the amount of data returned to what is actually available
not the size of the buffer.
Approved by: grehan (co-mentor)
Modified:
head/usr.sbin/bhyve/pci_ahci.c
Modified: head/usr.sbin/bhyve/pci_ahci.c
==============================================================================
--- head/usr.sbin/bhyve/pci_ahci.c Wed Apr 9 13:35:52 2014
(r264301)
+++ head/usr.sbin/bhyve/pci_ahci.c Wed Apr 9 14:50:55 2014
(r264302)
@@ -543,12 +543,14 @@ write_prdt(struct ahci_port *p, int slot
for (i = 0; i < hdr->prdtl && len; i++) {
uint8_t *ptr;
uint32_t dbcsz;
+ int sublen;
dbcsz = (prdt->dbc & DBCMASK) + 1;
ptr = paddr_guest2host(ahci_ctx(p->pr_sc), prdt->dba, dbcsz);
- memcpy(ptr, from, dbcsz);
- len -= dbcsz;
- from += dbcsz;
+ sublen = len < dbcsz ? len : dbcsz;
+ memcpy(ptr, from, sublen);
+ len -= sublen;
+ from += sublen;
prdt++;
}
hdr->prdbc = size - len;
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